Summary
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This project examined the relationship between psychophysical performance and fMRI activity by giving participants a signal-in-noise task where the depth had to be determined amongst noise dots. We manipulated performance by varying the difficulty of the near-far discrimination task. We then sought to find cortical regions whose activity varied in the same parametric manner.

Stimuli
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Random-dot stereograms generated in C# with different degrees of disparity noise (where stimuli are correlated but are not located at the target depth). We measured this as a percentage of signal (0% signal = only noise dots were presented), and used the following conditions: 0, 20, 40, 60 and 100% signal.  

Behavioural Results
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Note that there are two response types:
ResponeType = 1
If a green triangle appears, the participant presses button '3' for NEAR and '4' for FAR (and vice versa if a red square appears).
ResponseType = 2
If a green triangle appears, the participant presses button '3' for FAR and '4' for NEAR (and vice versa if a red square appears).

Design Files
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These show the order of presentation of the stimuli inside the scanner. The conditions are:
1 - fixation
2 - Far, 0% signal
3 - Far, 20% signal
4 - Far, 40% signal
5 - Far, 60% signal
6 - Far, 100% signal
7 - Near, 0% signal
8 - Near, 20% signal
9 - Near, 40% signal
10 - Near, 60% signal
11 - Near, 100% signal
